Hartford steam boiler in



J. M. ALLEN. STEAM BOILER SETTING.

No. 448,576. Patented Mar. 1'7, 189-1..-

Fcy. 3.

I WWWWWWUWQWUUWUUW I Attorneys UNITED STATES PATENT OFFICE.

JEREMIAH M. ALLEN, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE HARTFORD STEAM BOILER INSPECTION AND INSURANCE COMPANY,

OF SAME PLACE.

STEAM-BOILER SETTING.

SPECIFICATION forming part of Letters Patent No. 448,576, dated March 17', 1891.

Application filed November 20, 1890- Serial No. 372,106. (No model.)

To a whom it may concern:

Be it known that I, JEREMIAH M. ALLEN, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Steam- Boiler Settings, of which the following is a full, clear, and exact description, whereby any one skilled in the art can make and use the same.

The object of my invention is to provide a furnace that is particularly adapted forburning refuse or like material as fuel in furnaces. It is desirable that the flames from the combustion of the fuel should have as nearly as possible an unimpeded flow from the combustion-chamber, should be evenly distributed over the heating-surface of the boiler, and at the same time should be concentrated and direct in their flow. By the use of a flue or aperture in .the bridge-wall of peculiar shape this desirable result is accomplished and the advantages-gained in a manner and by means that are free from cumbersome details or expensive features.

My invention consists in the combination, in a furnace, of a firebox and a flue separated by the bridge-wall through which an opening is formed on the outlines of a contracted vein, or, as it is known,a oeina contractc, all as more particularly hereinafter described, and pointed out in the claim.

.Referring to the drawings, Figure 1 is a detail view in lengthwise section through the furnace and the boilensetting and in side elevation of the boiler. Fig. 2 is a detail view in vertical section through the fire-box. Fig. 3 is a detail view, on enlarged scale in horizontal section, through the flue or opening in the bridge-wall.

In the accompanying drawings, the letter A denotes a horizontal steam-boiler installed flue E for the passage of the flames and pro ducts of combustion from the fire-box to the combustion chamber or flue beneath the boiler.

In order to provide for a comparatively unimpeded flow of the flames and at the same time insure their comparatively even distribution over the heating-surface of the boiler, this opening is made in the form of a oema co'ntmcta, as is clearly shown in theseveral figures of the drawings. The shape of this opening prevents any interference of currents or choking of the outlet or line, such as would follow from the use of a flue of like area in cross-section that was not made in this peculiar form. By reason of this peculiar construction of the flue a more perfect combustion of the fuel, together with a better distribution of the flames and freer flow, is pro vided as compared with all of the old forms of flues or openings through the bridge-walls of furnaces of this class.

I claim as my invention- In a boiler-setting, in combination with a boiler having a combustion-chanlbei. beneath it, a fire-box having a bridge-wall through which a flue is formed on the outline of a oeinc contracfo, all substantially as described.

JEREMIAH M. ALLEN.

- Witnesses:

A. D. RISTEEN, E. J. MURPHY. 

